build: add the options to build entirely without tree-sitter

build.zig

@@ -1,6 +1,11 @@
 const std = @import("std");
 
 pub fn build(b: *std.Build) void {
+    const use_tree_sitter = b.option(bool, "use_tree_sitter", "Enable tree-sitter (default: yes)") orelse true;
+    const options = b.addOptions();
+    options.addOption(bool, "use_tree_sitter", use_tree_sitter);
+    const options_mod = options.createModule();
+
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
@@ -9,9 +14,8 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
-    _ = b.addModule("syntax", .{
-        .root_source_file = b.path("src/syntax.zig"),
-        .imports = &.{
+    const imports: []const std.Build.Module.Import = if (use_tree_sitter) &.{
+        .{ .name = "build_options", .module = options_mod },
         .{ .name = "treez", .module = tree_sitter_dep.module("treez") },
         ts_queryfile(b, tree_sitter_dep, "tree-sitter-agda/queries/highlights.scm"),
         ts_queryfile(b, tree_sitter_dep, "tree-sitter-bash/queries/highlights.scm"),
@@ -81,9 +85,14 @@ pub fn build(b: *std.Build) void {
         ts_queryfile(b, tree_sitter_dep, "tree-sitter-rust/queries/injections.scm"),
         ts_queryfile(b, tree_sitter_dep, "tree-sitter-superhtml/tree-sitter-superhtml/queries/injections.scm"),
         ts_queryfile(b, tree_sitter_dep, "tree-sitter-zig/queries/injections.scm"),
-        },
-    });
+    } else &.{
+        .{ .name = "build_options", .module = options_mod },
+    };
 
+    _ = b.addModule("syntax", .{
+        .root_source_file = b.path("src/syntax.zig"),
+        .imports = imports,
+    });
 }
 
 fn ts_queryfile(b: *std.Build, dep: *std.Build.Dependency, comptime sub_path: []const u8) std.Build.Module.Import {

src/file_type.zig

@@ -1,5 +1,11 @@
 const std = @import("std");
-const treez = @import("treez");
+const build_options = @import("build_options");
+
+const treez = if (build_options.use_tree_sitter)
+    @import("treez")
+else
+    @import("treez_dummy.zig");
+
 pub const FileType = @This();
 
 color: u24,
@@ -63,8 +69,12 @@ pub fn Parser(comptime lang: []const u8) LangFn {
 }
 
 fn get_parser(comptime lang: []const u8) LangFn {
+    if (build_options.use_tree_sitter) {
         const language_name = ft_func_name(lang);
         return @extern(?LangFn, .{ .name = "tree_sitter_" ++ language_name }) orelse @compileError(std.fmt.comptimePrint("Cannot find extern tree_sitter_{s}", .{language_name}));
+    } else {
+        return treez.Language.LangFn;
+    }
 }
 
 fn ft_func_name(comptime lang: []const u8) []const u8 {
@@ -112,8 +122,20 @@ fn load_file_types(comptime Namespace: type) []const FileType {
                     .lang_fn = if (@hasField(@TypeOf(args), "parser")) args.parser else get_parser(lang),
                     .extensions = vec(args.extensions),
                     .comment = args.comment,
-                    .highlights = if (@hasField(@TypeOf(args), "highlights")) @embedFile(args.highlights) else @embedFile("tree-sitter-" ++ lang ++ "/queries/highlights.scm"),
-                    .injections = if (@hasField(@TypeOf(args), "injections")) @embedFile(args.injections) else null,
+                    .highlights = if (build_options.use_tree_sitter)
+                        if (@hasField(@TypeOf(args), "highlights"))
+                            @embedFile(args.highlights)
+                        else
+                            @embedFile("tree-sitter-" ++ lang ++ "/queries/highlights.scm")
+                    else
+                        "",
+                    .injections = if (build_options.use_tree_sitter)
+                        if (@hasField(@TypeOf(args), "injections"))
+                            @embedFile(args.injections)
+                        else
+                            null
+                    else
+                        null,
                     .first_line_matches = if (@hasField(@TypeOf(args), "first_line_matches")) args.first_line_matches else null,
                     .formatter = if (@hasField(@TypeOf(args), "formatter")) vec(args.formatter) else null,
                     .language_server = if (@hasField(@TypeOf(args), "language_server")) vec(args.language_server) else null,

src/syntax.zig

@@ -1,5 +1,10 @@
 const std = @import("std");
-const treez = @import("treez");
+const build_options = @import("build_options");
+
+const treez = if (build_options.use_tree_sitter)
+    @import("treez")
+else
+    @import("treez_dummy.zig");
 
 const Self = @This();
 
@@ -7,10 +12,10 @@ pub const Edit = treez.InputEdit;
 pub const FileType = @import("file_type.zig");
 pub const Range = treez.Range;
 pub const Point = treez.Point;
+const Input = treez.Input;
 const Language = treez.Language;
 const Parser = treez.Parser;
 const Query = treez.Query;
-const Tree = treez.Tree;
 pub const Node = treez.Node;
 
 a: std.mem.Allocator,
@@ -19,13 +24,13 @@ file_type: *const FileType,
 parser: *Parser,
 query: *Query,
 injections: *Query,
-tree: ?*Tree = null,
+tree: ?*treez.Tree = null,
 
 pub fn create(file_type: *const FileType, a: std.mem.Allocator, content: []const u8) !*Self {
     const self = try a.create(Self);
     self.* = .{
         .a = a,
-        .lang = file_type.lang_fn() orelse std.debug.panic("tree-sitter parser function failed for language: {d}", .{file_type.name}),
+        .lang = file_type.lang_fn() orelse std.debug.panic("tree-sitter parser function failed for language: {s}", .{file_type.name}),
         .file_type = file_type,
         .parser = try Parser.create(),
         .query = try Query.create(self.lang, file_type.highlights),
@@ -85,7 +90,7 @@ pub fn refresh_from_buffer(self: *Self, buffer: anytype, metrics: anytype) !void
         .syntax = self,
     };
 
-    const input: treez.Input = .{
+    const input: Input = .{
         .payload = &state,
         .read = struct {
             fn read(payload: ?*anyopaque, _: u32, position: treez.Point, bytes_read: *u32) callconv(.C) [*:0]const u8 {

src/treez_dummy.zig

@@ -0,0 +1,104 @@
+pub const InputEdit = extern struct {
+    start_byte: u32,
+    old_end_byte: u32,
+    new_end_byte: u32,
+    start_point: Point,
+    old_end_point: Point,
+    new_end_point: Point,
+};
+pub const Range = extern struct {
+    start_point: Point = .{},
+    end_point: Point = .{},
+    start_byte: u32 = 0,
+    end_byte: u32 = 0,
+};
+
+pub const Point = extern struct {
+    row: u32 = 0,
+    column: u32 = 0,
+};
+pub const InputEncoding = enum(c_uint) {
+    utf_8,
+    utf_16,
+};
+pub const Input = extern struct {
+    payload: ?*anyopaque,
+    read: ?*const fn (payload: ?*anyopaque, byte_index: u32, position: Point, bytes_read: *u32) callconv(.C) [*:0]const u8,
+    encoding: InputEncoding,
+};
+pub const Language = struct {
+    var dummy: @This() = .{};
+    pub fn LangFn() callconv(.C) ?*const Language {
+        return &dummy;
+    }
+};
+pub const Parser = struct {
+    var dummy: @This() = .{};
+    pub fn create() !*@This() {
+        return &dummy;
+    }
+    pub fn parse(_: *Parser, _: ?*Tree, _: Input) !*Tree {
+        return &Tree.dummy;
+    }
+    pub fn parseString(_: *@This(), _: ?[]const u8, _: []const u8) !?*Tree {
+        return null;
+    }
+    pub fn destroy(_: *@This()) void {}
+    pub fn setLanguage(_: *Parser, _: *const Language) !void {}
+};
+pub const Query = struct {
+    var dummy: @This() = .{};
+    pub fn create(_: *const Language, _: []const u8) !*Query {
+        return &dummy;
+    }
+    pub const Cursor = struct {
+        var dummy_: @This() = .{};
+        pub fn create() !*@This() {
+            return &dummy_;
+        }
+        pub fn execute(_: *@This(), _: *Query, _: *Node) void {}
+        pub fn setPointRange(_: *@This(), _: Point, _: Point) void {}
+        pub fn nextMatch(_: *@This()) ?*Match {
+            return null;
+        }
+        pub fn destroy(_: *@This()) void {}
+
+        pub const Match = struct {
+            pub fn captures(_: *@This()) []Capture {
+                return &[_]Capture{};
+            }
+        };
+        pub const Capture = struct {
+            id: u32,
+            node: Node,
+        };
+    };
+    pub fn getCaptureNameForId(_: *@This(), _: u32) []const u8 {
+        return "";
+    }
+    pub fn destroy(_: *@This()) void {}
+};
+pub const Tree = struct {
+    var dummy: @This() = .{};
+    pub fn getRootNode(_: *@This()) *Node {
+        return &Node.dummy;
+    }
+    pub fn destroy(_: *@This()) void {}
+    pub fn edit(_: *Tree, _: *const InputEdit) void {}
+};
+pub const Node = struct {
+    var dummy: @This() = .{};
+    pub fn getRange(_: *const @This()) Range {
+        return .{};
+    }
+    pub fn asSExpressionString(_: *const @This()) []const u8 {
+        return "";
+    }
+    pub fn freeSExpressionString(_: []const u8) void {}
+    pub fn getParent(_: *const @This()) *Node {
+        return &dummy;
+    }
+    pub fn isNull(_: *const @This()) bool {
+        return true;
+    }
+};